The Texans made it official Tuesday, placing quarterback Ryan Fitzpatrick on injured reserve with a broken leg. Coach Bill O'Brien has said Thad Lewis or newly-signed Case Keenum will start Sunday against the Ravens.

The Texans announced that Tom Savage will miss Week 16 against the Ravens due to a knee injury he suffered on the penultimate play of Sunday's loss against the Colts. The loss of Savage, Ryan Fitzpatrick (broken tibia) and Ryan Mallett (pectoral) means that the starting job will come down toThad Lewis and newly-signed Case Keenum, coach Bill O'Brien told reporters, per the team's official website.

Lewis was signed to the 53-man active roster on Nov. 26, when Mallett landed on injured reserve with a torn pectoral muscle. He was the No. 3 quarterback on the depth chart entering Sunday's game against Indianapolis before Fitzpatrick went down with a season-ending injury. Second-stringer Tom Savage took over for Fitzpatrick but hurt his knee late in the game. As a result, the team signed Case Keenum on Sunday night, who played eight games in 2013 with the Texans and is familiar with the offensive.

"He'd been in our system not long ago," O'Brien said of Keenum, per the Houston Chronicle. "A lot of the things we're doing are what we were doing. He's a bright guy."

Texans backup quarterback Thad Lewis told the Houston Chronicle Monday he has "no question" he can be ready to start Week 16 against the Ravens, if needed.

"I actually don’t know anything," Lewis said. "I'm like you guys, just waiting and trying to find out. You can only control what you can control. I'm just trying to be ready and whatever the coach's decision, just roll with that."

Lewis was signed to the 53-man active roster on Nov. 26, when Ryan Mallett landed on injured reserve with a torn pectoral muscle. He was the No. 3 quarterback on the depth chart entering Sunday's game against Indianapolis before Ryan Fitzpatrick went down with a broken leg. Second-stringer Tom Savage took over for Fitzpatrick but hyper-extended his knee on the penultimate play of the game. He is expected to undergo an MRI. The team also signed Case Keenum following Fitzpatrick's injury.